I run 255/40 and 235/40 for snows on the stock 18s and they look fine. I run stock 265/40 and 245/40 on aftermarket 18 x 9.5 and 10.5 and they look a little more pinched than I would like, but are OK until I need new tires. 235/40 on 9.5 would be too pinched for my tastes. Some people like that look, but not me. I prefer 255/40 to 265/40 for 9.5.